66687017 has 4 divisors (see below), whose sum is σ = 70196880. Its totient is φ = 63177156.

The previous prime is 66687011. The next prime is 66687053. The reversal of 66687017 is 71078666.

66687017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66687017 - 2⁶ = 66686953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66687011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1754903 + ... + 1754940.

It is an arithmetic number, because the mean of its divisors is an integer number (17549220).

Almost surely, 2^66687017 is an apocalyptic number.

It is an amenable number.

66687017 is a deficient number, since it is larger than the sum of its proper divisors (3509863).

66687017 is a wasteful number, since it uses less digits than its factorization.

66687017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509862.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 66687017 is about 8166.2119125088. The cubic root of 66687017 is about 405.5213871202.

The spelling of 66687017 in words is "sixty-six million, six hundred eighty-seven thousand, seventeen".